lightweight Node Promise-based request module

featherRequest.js

const http = require('http')
const https = require('https')
const url = require('url')

module.exports = {
  urlCheck,
  request
}

function urlCheck(url) {
  return request(url)
    .then(headers => {
      switch(ParseInt(headers.statusCode / 100, 10)) {
        case 3:
          return request(headers.location)
        case 4:
          Promise.reject(headers)
        default:
          return Promise.resolve(headers)
      }
    })
}

function request(link) {
  const parsedURL = url.parse(link)
  const options = {
    protocol: parsedURL.protocol,
    hostname: parsedURL.hostname,
    method: 'HEAD',
    path: parsedURL.path
  }
  let protocolHandler = parsedURL.protocol === 'https:' ? https : http

  return new Promise((resolve, reject) => {
    const req = protocolHandler.request(options, (res) => {
      resolve(res.headers)
    })
    req.on('error', (e) => reject(e))
    req.end()
  })
}